Developing Apparatus Carrier Accumulation Prediction
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Solution Overview
Problem
In trickle developing apparatuses for electrophotographic image forming machines, the accumulation of carrier beyond the discharge level leads to inefficiencies and potential damage, especially when printing high coverage ratio images, as the existing systems either waste developer or risk overflow without effective prediction or control mechanisms.
Innovation Solution
A developing apparatus with stirring members, a developer holder, a replenishing tank, and a discharging mechanism, along with a calculating device that predicts carrier accumulation by integrating the remaining carrier amount, allowing for controlled replenishment and discharge without the need for level sensors, thus preventing overflow and optimizing developer usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the discharging amount using the trickle discharging mechanism is set higher to print out images having high coverage ratios, then high coverage ratio images can be printed, but when images having ordinary coverage ratios are printed out, the discharging amount increases and the developer inside the developing apparatus is used wastefully
Solution Approach 1:
The patent implements dynamic adjustment of the discharging amount based on the actual coverage ratio of printed images. The control unit calculates the coverage ratio from image data and dynamically sets the discharging amount accordingly - higher discharge for high coverage ratio images and lower discharge for ordinary coverage ratio images. This resolves the contradiction by making the discharging mechanism adaptive rather than fixed, eliminating wasteful discharge while maintaining the ability to handle high coverage ratio images.
2Loss of substance
If the discharging amount using the trickle discharging mechanism is set lower to print out images having low coverage ratios, then developer waste is reduced, but when images having high coverage ratios are printed out continuously, developer discharge is not carried out sufficiently
Solution Approach 1:
The patent employs a feedback control mechanism where the control unit continuously monitors the coverage ratio of printed images and adjusts the discharging amount in response. When high coverage ratio images are detected, the system increases the discharging amount to prevent carrier accumulation and overflow. This feedback loop ensures sufficient discharge during high coverage printing while maintaining low discharge during ordinary printing, resolving the contradiction between reducing waste and ensuring sufficient discharge.
3Quantity of substance
If toner is replenished into the developing apparatus by replenishing fresh developer containing toner and carrier to compensate for the toner consumed abundantly, then toner consumption is compensated, but the carrier replenished simultaneously with the toner is not consumed but remains inside the developing apparatus
Solution Approach 1:
The patent extracts and separates the carrier discharge function from the regular developer replenishment process. Instead of simply replenishing developer without consideration of carrier accumulation, the system calculates the coverage ratio and determines an appropriate discharging amount to remove excess carrier. This extraction of the carrier management function resolves the contradiction by allowing toner replenishment while simultaneously managing carrier accumulation through controlled discharge.
4Duration of action of stationary object
If the amount of the carrier stored in a two-component developing apparatus is increased to extend the life of the developing apparatus, then the life of the developing apparatus is extended, but the developing apparatus becomes larger in size
Solution Approach 1:
The patent implements a carrier recovery and replacement system where deteriorated carrier is gradually discharged and replaced with fresh carrier through the trickle discharging mechanism. Instead of storing large amounts of carrier to extend life, the system actively manages carrier quality by discarding spent carrier and replenishing fresh carrier with each developer replenishment cycle. This resolves the contradiction by extending apparatus life through carrier renewal rather than through increased carrier storage volume.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for accurate prediction and management of carrier accumulation, preventing overflow and optimizing toner and carrier usage, thereby ensuring efficient operation and extending the life of the developing apparatus without increasing complexity or cost.
Implementation Method 1
stirring members for stirring a developer-tank-contained developer containing toner and carrier inside a developer tank while conveying the developer
Implementation Method 2
the toner and carrier are charged by friction contact therebetween to predetermined polarities
Implementation Method 3
a discharging mechanism provided in the developer tank to discharge an excessive amount of the developer-tank-contained developer outside the developer tank
Data Source
AI summary
The present invention provides a developing apparatus capable of predicting how much carrier is accumulated inside a developer tank beyond the discharge level of a trickle discharging mechanism in the case that images having high coverage ratios are printed out continuously in a trickle developing apparatus that uses a two-component developer. The developing apparatus, having stirring members for conveying and stirring a developer-tank-contained developer and a developer holder, comprises a developer replenishing tank; a discharging mechanism for discharging an excessive amount of the developer-tank-contained developer outside the developer tank when the amount of the developer-tank-contained developer inside the developer tank has exceeded a predetermined amount; and calculating device for calculating the amount of the carrier existing inside the developer tank, and judges using the calculating device that the integrated value of carrier obtained by integrating the amount of the carrier existing inside the developer tank is likely to exceed a predetermined excessive accommodation amount of carrier.